<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>
<script src="jquery-3.3.1.min.js"></script>
<script>
Promise.all([
	$.ajax({url:'data/arr.txt',dataType:'json'}),
	$.ajax({url:'data/json.txt',dataType:'json'}),
	$.ajax({url:'data/num.txt',dataType:'json'})
]).then( results=>{
	let [arr,json,num] = results;
	alert('成功了');
	console.log(arr,json,num);
}, err=>{
	alert('失败了');
});

</script>
</body>
</html>